I feel sorry for you man. I have ordered 50 pieces and got a few that were looking just as bad as yours. I have returned them to Iron Studios. I do not know if you follow this thread but most of the guys here knew in advance about the problems with this piece.
I have opened and inspected all 50 pieces I received. All of them had painting problems but I have only kept the ones that were acceptable.
I also took pictures of the and made them available for everyone who pre-ordered this statue with me and a few guys even chose their statue edition number. You should have asked the store you bought this to open and inspect the piece and if possible to take some pictures for you.
I agree with you that Iron Studios have to improve their painting on their future releases. It does not look they did it with the Iron Man 1/10 scale by the production piece pictures released this morning. This 1/10 Iron MAn MArk XLII was probably painted by the same factory that did paint the 1/4 scale.
I have heard they are changing the factory they use in China because of these late problems and I think the first product being made on the new factory will be the Iron Man Mark VII 1/6 scale for the Avengers Dio. I really hope they step up and do a better job and most of all do a better job controlling the quality of their products. They have so much potential but they cannot keep doing this or they will be labelled as a second class collectibles company and it will be really difficult to get our hard earned money and our confidence again.